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[cc2-qbe] Check void type out of int and floats

Voidtype hasn't any of the flags INTF or FLOATF,
so it was generating an abort()

--- a/cc2/arch/qbe/code.c

+++ b/cc2/arch/qbe/code.c

@@ -310,7 +310,6 @@

 {

 	if (tp->flags & INTF) {

 		switch (tp->size) {

-		case 0:

 		case 1:

 		case 2:

 		case 4:

@@ -323,6 +322,8 @@

 			return "s";

 		else if (tp->size == 8)

 			return "d";

+	} else if (tp->size == 0) {

+		return "w";

 	}

 	abort();

 }